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This mineral crystallizes in the form of thin flattened plates, tabular crystals, as well as aggregates. Its commonly found in association with Apophyllite and Heulandite within basalt and other volcanic rock.
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In its pure form, it is also referred to as Sard (colored with iron oxide) a green variety or Carnelian. This is a beautiful piece with lots of sparkle and texture! Chalcedony is a form of Quartz in microcrystalline form.
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